. >> president obama being the first black president of the united states, talked about how he admired man tella from afar. he remembers seeing him from his >>> right now, people in south africa are remembering their president as people mark his death with prayer. celebrating his life. the 94-year-old chied thursday and will be buried one week from today. here in washington you have a chance to attend a memorial service for nelson mandela. offering a limited number of tickets for wednesday morning's memorial service held at the national cathedral. people have been gathering to lay flowers on the statue of mandela. condolence book is available for people to sign until tuesday. hosting nightly vigils tonight, tomorrow and tuesday night. >> this morning, we've learned four of the five living u.s. presidents will head to south africa this week. former president jimmy carter, the latest to confirm that he will head to johannesburg. this comes after presidents barack obama, bill clinton and george w. bush -- george h.w. bush is unable to go because of health issues. news 4's jim vance is als